<b>The Mass-Energy Gravity (MEG) Model: A Viable Alternative to ΛCDM Without Dark Energy</b>

This paper introduces the Mass-Energy Gravity (MEG) Model, a novel approach to cosmic expansion that eliminates the need for dark energy. MEG proposes that cosmic expansion itself generates energy-density gradients (EDGs), which in turn shape gravitational dynamics and structure formation. Unlike ΛCDM, which relies on a cosmological constant (Λ) to drive acceleration, MEG explains the observational effects of acceleration as a consequence of differential expansion across cosmic structures, without invoking an external repulsive force.We present the latest refinements of the MEG model, showing that it now:<br>Accurately fits supernova, BAO, and CMB constraints without requiring dark energy.<br>Improves predictions at high-redshift (z&gt;2.5z&gt;2.5), outperforming ΛCDM in JWST/DESI datasets.<br>Predicts alternative observational signatures, including subtle differences in gravitational lensing and cosmic void distributions.A detailed statistical comparison with ΛCDM, including chi-squared analysis, Bayesian likelihood estimation, and Akaike Information Criterion (AIC), demonstrates that while ΛCDM remains preferred due to its simplicity, MEG provides a physically motivated alternative with competitive predictive power.This study suggests that the apparent cosmic acceleration is not fundamental, but rather an observational effect of differential expansion rates driven by energy-density variations. This challenges the necessity of dark energy and opens new avenues for understanding cosmic evolution under an energy-density-based framework.<i>For inquiries, please contact me at:</i> <b>[email protected]</b><br><br>